If it's not #flyerfriendly and DL has done it, you bet your butt it's on UA's to do list.
edit: to be clear about why this is anti-flyer, I actually like how well DL has disclosed the terms of these kinds of fares and can only hope UA does the same. Given the current lack of intense competition between the legacy 3, however, these fares ultimately supplant the deepest discount fares (at their current level, based on patterns seen at DL) rather than introducing a new lower level of fare that would spur demand.